Y'know, I'm starting to doubt my own memories. I guess that's a sign I'm spending too much time on web forums, not enough time actually doing anything in particular.
But I did have something similar happen while entering Ukraine: the border guard (female, disconcertingly dressed in miniskirt and high-heeled boots) glanced at my elaborately faked document, which had served me well throughout Western and Eastern Europe plus a good portion of Asia Minor and North Africa, and dismissed it contemptuously. I apologized and dug out the real one. She did not smile, but neither did she ask me for proof of insurance, so I guessed I was ahead of the game.